Improved expanding die



gli-tink @faire jtlatwt @fitta IMPROVED BXPANDING DIE.

alle tlgihnlr niemals in tlgisefhttai ntmt ma nuttig ruft nf'tlge smut.

TO ALL WHOM IT MAY'CONCERN:

Be it knownthat I, B. T. LOOMIS, of 495 Broadway, city, county, and State of New York, have invented a new. and improved Expanding Die; and I do hereby declare that the following is a full, clear, 'and exact description thereof, which will enable others skilled in the art to make and use the'same, reference being had tothe accompanying drawings, forming. part of this specification, in whichi Figure l is a face viewrot my improved die. v Y Figure 2 is a detail sectional view ofthe same, taken through the line a; rv, g. 1. Similarletters of reference indicate corresponding parts. My invention has for its object to furnish an improved expanding die, so constructed that it may be adjusted to cut a screw-thread upon bolts or pipes ofdiierent sizes; 'and it consists of the combination ofthe dove-tailed4 cutters, interior slotted tube, and cutter-soat with each other, and in the combination of the operating hand with the interior tube and with the cutter-seat, the whole being constructed und arranged as hereinafter more fully described.'

A is the cutter-seat, in the face and interior surface of which are formed inclined dove-tailed grooves for the reception of the inclined `flanged or dove-tailed heads of the cutters B. C is an interior tube, through the sides of'which are formed slots, into which the bodies of the cutters iit, and through which they project, as shown in iig. 2, so that as the interior tube is drawn inwards the cutter-heads will be drawn into the shallower parts ofthe dove-tailed slots, causing their cutting faces to project further inward. And as the interior tube is pushed outward the cutter-heads will be moved into the deeper parts of said grooves, drawing their cutting faces outward. This construction enables the die to be so adjusted as to cut screw-threads upon different-sized bolts or pipes. Upon Vthe outer and of the cutter-seat A is formeda flange, a', having a groove formed around the base of its outer surface, as shown in g. 2. D is aband or nut fitting upon the end of the cutter-seat A, and having a flange, cl, fitting around the flange a. Through the flange QZ are passed pins, the innerends of which enter the groove in the ange a', or enter shoes or circular pieces placed in said groove, so that the band D may be revolved upon the cutter-seat A without moving either forward or back. Upon the interior surface of the band or nut'D is cut a screw-thread or-its equivalent, fitting into a screw-thread or `its equivalent cut-upon the end of theintcrior tube C, so that by turning the band D in one or the other directionthe cutters B may be expanded or contracted, according to the size of the bolt or pipe upon which the thread is t'o bereut.v The pitch of the screw-thread cut upon the tube C and band D may be more or less steep, according as it is desired that the cuttersB may be-drawnfin quick or slow, so that the die may be operated by machine or by hand, as may be desired orcnvcnient.v The .end of the cutter-seat A and of thc band D are squared oil', so that they may be i convenientlygrasped by a wrench to operate them. If desired, the iange a lhfaybe formed `near the outer edge of the' end of thecutter-seat A. In this case the groove is formed upon its inner surface, andthe flange d of theband D is fitted within-'the said flange a', the pins or their equivalent being passed throug'hithe flange el from lthe inner side. l y i What I claim, and desire to secure by Letters Patent,` is- 1. The cbmbination of the dove-tailed cutters B, interior slotted tube C, and Lcuttcrqseat A tvitheachother, substantially as herein sho-wn and described, and for the purpose set forth.

2. The combination of the band or nut D with the cutter-seat Aand the interior slotted tube C-substantially as herein shown and described, and for the purpose set forth. 'l

The aboverspecification of my invention signed by me this 17thday of April,`18 67. l

B. r. Leo MIS.

Witnesses:

WM. F. McNAMAaA, JAMES T. GRAHAM. 

